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How to return raw PDF data using the Node client library?

trav wrote on 2013-05-27:
I am using the Node client library as per the following instructions...

var pdf = require('pdfcrowd');

// create an API client instance
var client = new pdf.Pdfcrowd("username", "apikey");

// convert an HTML string and send the generated PDF in a HTTP response
client.convertHtml('<html>regular HTML code</html>', pdf.sendHttpResponse(response));

How do I return the raw pdf data? I don't want to automatically send it it to the client or save it. I tried the following but it does not work:

client.convertHtml('<html>regular HTML code</html>', function(pdfData) {...});
trav wrote on 2013-05-27:
Figured it out. Here is the code that does it, for any who might have the same problem:

client.convertHtml( bodyHTML, {
pdf: function( rstream ) {
rstream.on( "data", function( chunk ){
data.push( chunk );
rstream.on( "end", function() {
var buffer = new Buffer( data.reduce(function( prev, current ) {
return prev.concat( current ));
}, []));
callback( buffer.toString( "base64" ));
}, pdfConfig );